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From: john larkin <jl@glen--canyon.com>
Newsgroups: sci.electronics.design
Subject: Re: Teledyne GPD462
Date: Tue, 29 Apr 2025 08:52:07 -0700
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On Tue, 29 Apr 2025 12:47:03 -0000 (UTC), Phil Hobbs
<pcdhSpamMeSenseless@electrooptical.net> wrote:

>Don <g@crcomp.net> wrote:
>> Phil Hobbs wrote:
>>> brian wrote:
>>>> I saw a paper (https://apps.dtic.mil/sti/pdfs/ADA030178.pdf) , active
>>>> antenna referring to a GPD 462 . - Hybrid amplifier
>>>> 
>>>> Does anyone know what the internal circuitry was?
>>> 
>>> That’s one of Avantek’s “low cost” hybrid MIC amplifiers. I used its
>>> brother GPD-464 a fair amount back in the 80s. They were cheaper than their
>>> very nice GPD-211 iirc.
>>> 
>>> AFAICT it’s a vanilla NPN Darlington, like most others of that era.
>>> 
>>> I still have the databook someplace, I think.
>> 
>> I think you mean MMIC
>> 
>> Danke,
>> 
>
>Nope. 
>
>It’s a hybrid, not monolithic. 
>
>Cheers 
>
>Phil Hobbs 

I think of Darlingtons as slow - they usually are - but most MMICs are
Darlingtons.

I like the simple, older parts, the ERA and LEE and GALI ones. The
more modern self-biasing parts have loopy low-frequency response.